Links using a border-bottom instead of text-decoration should still get the default InteractionRegion border-radius
<rdar://problem/118173683>
Pull request: https://github.com/WebKit/WebKit/pull/20675
Committed 271167@main (ce815ebcee43): <https://commits.webkit.org/271167@main> Reviewed commits have been landed. Closing PR #20675 and removing active labels.